Steam-power plant



April 15,1930. XEMACRARD 1,154,283

"- STEAM POWER PLANT i e March .1926 2 sheds-sheet 1 I 1 I I 1 I r awwanboz JZ A. W

April 15, 1930.. E. A. PACKARD 1,754,283

STEAM POWER PLANT' Filed Mamh 1926 2 Sheets-Sheet 2 I M I I I I INVENTOR ATTORNEYS i of Fig.2.

Patented Apr. 15, 1930 UNITED STATES PATENT OFFICE-5 EDWIN A. PACKARD, OF YONKERS, NEW YORK, ASSIGNOR TO INTERNATIONAL COM BUSTION ENGINEERING CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE STEAM-POWER PLANT Application filed March 1, 1926. Serial No. 91,342.

improvements in the reheating of steam. The nature and advantages of'the lnvention Wlll become clear in the following specification of the best embodiment of my invention now known to me. 1

The preferred form of my invention is illustrated in the accompanying drawings, wherein- F ig. 1 is a diagrammatic view partly in section and partly in side elevation illustrat in my invention,

T igs. 2 and 3 are similar views illustrating modifications of the invention, and

Fig. 1 is an enlarged fragmentary view, partially in section,of certain of the details Referring now to Fig. 1, the reference letter A indicates the furnace of any suitable form of steam "enerator B referabl a hi h pressure generator. The referenceletter G indicates a high pressure prime mover, such as a turbine, and the reference letter D indicates a low pressure prime mover, such as a turbine.

Beyond the boiler B is a superheater 7 which supplies steam to the high pressure turbine G, as by means of the pipe 8. The exhaust of the high pressure turbine is led through any suitable form of heat interchanger 9 by means of the pipe 10, the re heated exhaust steam being led to the low pressure turbine D after being reheated in the heat interchanger 9. i

As a medium for heating the exhaust steam I pass steam from the boiler through a valve controlled pipe 1 1 to the reheater 9, from whence it passes through pipe 13 to the superheater 11 and then through valve controlled pipe 12 and pipe 8 to the high pressure turbine C. In this arrangement it will be seen that the high pressure steamfrom the superheater 7 mixes with the superheated, reheated steam flowing from the pipe 12 into pipe 8.

By virtue of the difl'erence in temperature and pressure as between the steam to be reheated andthe steam used to reheat, a very effective transfer of heat is secured, and all special forms of reheating apparatus, such as employ their own source of heat,jare avoided.

Referring now to Fig. 2, the arrangement is in all substantial respects similar. In this case, however, steam from the superheater 7 branches, part going to the high pressure engine E by the branch 15 and part going to the heat interchanger'9 byway of'the branch 16, where it is utilized to reheat the exhaust from the high pressure prime mover which is led to the heat interchanger by the pipe 17. After imparting heat to the exhaust steam, the steam led to the interchangerby the pipe 16 returns to the second superheater 11 by way of the pipe 18, and the steam, after being superheated in this superheater, joins with the steam passing from the superheater 7 to the branch 15 through the medium of thevalve controlled pipe 19. The device 22, including the valves 20 and 21 is for regulating the relative amounts of steam which can flow from the superheater 7 to the reheater 9 and to the the valve 21 is normally full open. When the temperature of the steam rises sufficiently to cause the device 23 tooperate to close the circuit, the solenoid is operated to partially close the valve 21 and to move the valve 20 toward full open position, in consequence of which the flow of steam from the superheater 7 is proportioned between the pipes 15 and 16, less steam going through the pipe 15 than through the pipe 16 when the solenoid has operated as just described. 'Since this operation means that more steam from the superheater 11 will pass through the pipe 15 than before, the temperature of the exhaust in line 17 will be lower because of the fact that the superheater 11 follows the superheater 7 and therefore does not have the steam passing therethrough superheated to as high a degree as tzfihe steam passing through the superheater In the arrangement of Fig. 3, three prime movers G, H and I of different pressures are rovided, and steam from the superheater 7 is first led to en inter-changer 9, where it is utilized to reheat the exhaust from the mover G, after which it is led to another heat interchanger 9 where it is used to reheat the steam from the second prime mover H, the steam thereupon being led to the superheater 11 where it is superheated and delivcred to the high pressure prime mover G.

What I claim 18 2- p 1. In combination, a boiler, a su erheater, a high pressure engine, a pipe lea ing vfrom the superheater to the high pressure engine, a low pressure engine, a reheater between the engines, a pipe leading from the boiler to the reheater for supplying steam for reheating the exhaust from the high, pressure engine, a second superheater, a pipe leading from the reheater thereto, and a pipe leading from such superheater tojoin with the pipe lead ing from the first superheater to the high pressure engine.

'2. In combination, a boiler, a superheater, an engine, a pipe leading from the superheater to the engine, a second ipe in parallel with the first pipe and conucting steam from said superheater to an exhaust steam reheater, such reheater, and means for proportioning the flow through said pipes, together with a second superheater, a pipe leading thereto from the reheater, and a pipe leading from such .superheater to join with the pipe leading from the first superlieater to the ene. V In testimony whereof I have hereunto signed my name.

EDWIN A. PACKARD. 

